Smart seek? How to activate

Dear Forum,

I am using the Kodi app on my iDevices after having used a Logitech Harmony via CEC from my TV to KODI.
I can’t seem to get the smart seek feature (repeated presses on left/right seek +3, +5, +10, +30, … seconds) to work.
Every time I press the right/left keys in the app Kodi skips only +/-10 seconds.
The ffwd, frev buttons above allow me to fwd with 1x, 2x, 4x, … speed when I press them repeatedly.
I really loved the smart seek intervals and would like to use this in the app as well.

How can I activate this?

Note: I’ve checked the “Skip steps” settings in the app’s video settings and they are set accordingly. Here the text refers to the “skip” buttons. Are these left/right or does this refer to the ffwd/frev buttons?
“Skip delay” is set to 750ms. Here the text reads “Only applies when using smart skipping”. I presume that is what I want? Where can I find the setting to activate “smart skipping”?

Thank you!